Afon Clywedog

The Afon Clywedog is an upland headwater tributary of the River Severn in Powys, Wales. It is approximately 29 km long and has its source on the flanks of Plynlimon and has its confluence with the Severn in Llanidloes. The annual rainfall over the catchment is between 1737 mm and 1836 mm.[1]

Afon Clywedog
Clywedog at the base of Clywedog reservoir
Location
CountryUnited Kingdom, Wales
RegionMid Wales
CountyPowys
SettlementLlanidloes, Staylittle
Physical characteristics
Source 
  locationPlynlimon, Powys, Wales
  coordinates52.5411°N 3.7168°W / 52.5411; -3.7168
Mouth 
  location
River Severn, Llanidloes
  coordinates
52.4508°N 3.5406°W / 52.4508; -3.5406
Length29.0 km (18.0 mi)
Discharge 
  locationLlanidloes
  average2.26 m3/s (80 cu ft/s)

River regulation

A large part of the upper catchment of the river is inundated by the Clywedog reservoir which stores water from the catchment, especially during the winter months, and releases it during periods of low flow to support the flow in the Severn so that drinking water may be abstracted downstream.[2] The management rules also enable the reservoir to maintain the reservoir below maximum level during the winter so that there is capacity to absorb flood flows to reduce the impact of flooding further down the main river.[3] The Afon Clywedog thus has a highly regulated flow with relatively high flow in dry conditions and reduced flow in wetter weather.

See also

References

  1. "54013 - Clywedog at Cribynau Spatial data". National Rivers Flow Archive. Centre for Ecology & Hydrology. Retrieved 25 April 2016.
  2. "Severn Trent Water - Llyn Clywedog". Archived from the original on 12 May 2014. Retrieved 11 May 2014.
  3. Hydrology in Practice. Shaw E

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